Routine Space Environment Product Issued Weekly
Issued by NWS

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WEKHIL

:Product: 7-day Space Weather Highlights
:Issued: 2014 Jul 21 0624 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
# http://www.swpc.noaa.gov/wwire.html
#
#                7-day Space Weather Highlights
#
Highlights of Solar and Geomagnetic Activity
14 - 20 July 2014

Solar activity was low, with the only C-class activity observed on
the first two days of the week. Region 2009 (S08, L=221,
class/area=Hhx/300 on 14 July) produced C1 flares on 14 July at 1246
UTC and 15 July at 0305 UTC as it rotated around the west limb. The
remainder of the week was characterized by only B-level activity,
with Region 2113 (N07, L=167, class/area=Dao/40 on 14 July)
producing a B5 on 16 July at 2300 UTC and a B2 on 18 July at 1756
UTC.

On 18 July, a 17-degree filament eruption centered near N26E09 was
observed lifting off the visible disk in SDO/AIA 304 imagery
beginning at approximately 0200 UTC. Another filament eruption
centered near S24E22 was observed in SDO/AIA 304 imagery beginning
at approximately 0748 UTC. Available coronagraph imagery from SOHO
and STEREO did not conclusively suggest any Earth-directed coronal
mass ejections (CME) accompanied these events. Later in the week, an
prominence erupted from he east limb beginning at approximately
20/0200 UTC. A CME was subsequently observed off the east limb in
SOHO/LASCO C2 imagery at 20/0312 UTC. Neither this, nor other CMEs
observed during the week were judged to be particularly
geoeffective.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at
normal levels.

Geomagnetic field activity reached unsettled levels from 12-21 UTC
on 14 July then declined to quiet levels for the remainder of the
week.

On 14 July, a corotating interaction region and negative polarity
coronal hole high speed solar wind stream arrived in a geoeffective
position. The CIR arrived at the ACE spacecraft around 14/1300 UTC
accompanied by a solar sector boundary change from a positive to a
negative sector and followed by increasing wind speed and
temperature. Remnants of a 09 July CME glancing blow may have been
intermingled with the high speed stream. Wind speed at ACE rose to
about 500 km/s between 11-12 UTC on 15 July. It declined afterward;
falling to 274 km/s by the end of the week.

Following the CIR arrival at ACE, a geomagnetic sudden impulse of 10
nT was observed at the Boulder magnetometer at 14/1443 UTC.
Unsettled conditions were observed for three synoptic periods:
12-15, 15-18 and 18-21 UTC, before returning to quiet levels which
persisted through the 20th.


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